Sash-balance.



F. W. ARVINE.

SASH BALANCE.

APPLICATION FILED JUNE 26.1916.

Patented May 22, 1917.

INVEIVTUR 6141.1 ZJM.

A TTORN E Y UNITED stm'rns PATENT onnron.

IBEELING w. ARVINE, or noonnsrnn, NEW YORK.

sAsH-BALANQE.

Specification of Letters Patent.

Patented May 22, 191 '7.

Application filed June 26, 1916. Serial No. 106,016.

type which shall beflreadily adjustable place to the exact weight of the sash, cheap to manufacture, easy to install and that can be inclosed within the sash.

It has for a further object to provide a device of this character arranged to work with suflicient friction without requiring any special member for hindering its free operation, such as a brake, and which will permit of the laying of brick, concrete, plaster or studding directly against the window jamb without interfering with the operation.

Other objects and advantages of the in vention will hereinafter appear and the novel features thereof will be particularly pointed out in the appended claims.

The invention is clearly illustrated in the accompanying drawings, which, with the numerals of reference marked thereon, form a part of this specification, and in which- Figure 1 is an elevation of a portion of the window sash with portions broken away and parts in section. V

Fig. 2 is a side elevation of the arbor.

Fig. 2 is a view thereof at right angles to Fig. 2.

Fig. 3 is a detail of the spring.

Fig. 4 is a section through Fig. 1 on the line 4-4.

Like numerals of, reference indicate like parts throughout the several views.

Referring to the drawings, the invention is shown as applied to a window sash 9 of ordinary construction except that it is provided with a chamber or pocket 10, as seen in Figs. 1 and 4, within which is disposed the coiled sprin 1 which is of the general nature of an or inary clock spring.

The spring 1 is mounted upon an arbor 2 which is provided with a longitudinal slot 7 with a notch 8 at one end and a head has for its objects 5 at the other having a slot 6 similar to the slotted head of a screw.

In practice, the arbor is inserted in a transverse opening in the sash, as seen in Figs. 1' and 1, and the bent end 11 of the spring is inserted in the slot 7 of the arbor.

. The nail 12 is then driven into the edge of the sash so as to engage in the slot 8 of the inner end of the arbor, which slot extends between projecting teeth, as seen at 13 in Fig. 2, the sash being provided with a taperedv notch 14 for the reception thereof,

asseen in Fig. 4.

As seen in Fig. 1, the spring is shown at 41 as in frictional engagement with the upper end of the mortise or chamber 10 within which it is disposed, the free end of the spring being extended through an opening in the outer face of the side stile of the sash and secured in any suitable manner to the frame 15, as shown at 3 in Fig. 1.

By inclosing the balance within the sash instead of in the frame or chamber as usual, I dispense with the weight pockets, the most common source of cold air drafts, and thus avoid the latter, and, furthermore, studding, masonwork or concrete may be placed tightly against the jamb.

The spring can be readily adjusted exactly to the weight of the glazed sash and re-adjusted whenever the weight is changed by dampness, drying or renewal of'the glass. This adjustment is accomplished by means of a screw-driver engaged in the slot 6 of the head 5 of the arbor. The spring is of suitable Width and thickness as seen in Fig. 1 and has the requisite strength to support the sash without exceeding in size the limits of an ordinary sash.

The friction provided by the spring when drawn down upon itself and confined between the sash and the jamb, and by the bearing upon the upper end of the mortise or chamber 10, although slight, proves suflicient to hold the sash when placed in any desired position, because when the sash is pulled entirely down, which motion winds the center of the spring closer, there is little of the spring left in the sash, and when raised clear up, the spring with all its coils in the sash is in a relaxed condition.

In applying my device it is only necessary to hold the central part of the spring in the mortise in position to receive the arbor and when this has been inserted with the bent end of the spring engaged in the slot and the outer end of the spring passed through the opening in the sash and at tached to the jamb,"the sash can be put in position. The holding device 12 being removed, the spring is then wound up the balance of the sash and the holding device 12 then inserted. To let the spring back, the arbor is turned sufiiciently to raise the head and a bit of wood, a knife point or any other suitable substance is placed under it so as to disengage the inner end thereof from the holding device 12 when the screw driver may be allowed to turn in the handle, thus relaxing the spring as much as desired. The piece of wood or other article is then removed and the arbor forced inward so that its inner end will engage with the holding device 12.

What is claimed as new is 1. A window sash having a pocket with a transverse hole in the walls thereof, a scroll spring located in said pocket, an arbor inserted in said hole and extended through the center of the spring for suspending the latter and for winding it' in place to adjust the tension upon the sash and the jamb of the window frame, and means detachably securin'g said arbor in position, said arbor hav ing a toothed end, and means acting as a ratchet therewith, the upper wall of the pocket serving as a friction surface against Which the upper coil of the spring is drawn by virtue of its tension.

2. A Window sash having a pocket, an arbor mounted therein with its inner end formed with projecting teeth with a passage between them, the sash being provided with a tapered notch to receive said teeth, a spring connected at one end with the arbor and arranged in said pocket, and means in the sash at an angleto said arbor for engaging one wall of the said passage to prevent turning of'the arbor FREELING ARVINE.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

' Washington, D. 0. 

